Getting window previews
mbrush at codebrainz.ca
Sat Jul 18 01:48:20 CEST 2015
On 15-07-17 02:09 PM, adlo wrote:
> What functions does skippy-xd use to get the previews?
I have no idea what that is.
> What functions does xfwm4 use?
I have no idea, I would guess XGetImage or something else depending on X
extensions maybe. There was a thread about it on this mailing list a
while back (search for "Window previews in xfwm4"), maybe it gives some
> How CPU-efficient is XGetImage (or XShmGetImage) compared to the other two methods? Which method is the most CPU-efficient?
I don't know what the other two methods are but I would guess they're
"efficient enough". If you got everything working and after
using/profiling found too slow, then you could look to more advanced
ways. I've used XGetImage before on dual-screen root window, showing a
preview in a widget at ~30fps and it was "fast enough" for my use.
> Do you know any details about the methods I could use to convert the image to a GdkPixbuf?
If it's for preview you probably don't need GdkPixbuf as you can convert
straight from an XImage to a Cairo image surface and paint it onto a
widget. There's probably tricks to avoid extra copying too, I'm no
expert on Xlib stuff.
More information about the Xfce4-dev